|Publication number||US3256670 A|
|Publication date||Jun 21, 1966|
|Filing date||Jul 13, 1962|
|Priority date||Jul 23, 1962|
|Publication number||US 3256670 A, US 3256670A, US-A-3256670, US3256670 A, US3256670A|
|Original Assignee||Ennio Tersigni|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Referenced by (46), Classifications (16)|
|External Links: USPTO, USPTO Assignment, Espacenet|
June 21, 1966 E. TERSIGNI 3,256,670
PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS 6 Sheets-Sheet 1 Filed July 15, 1962 INVENTOR MJJMM ATTORNEYS June 21, 1966 E. TERSIGNI 3,256,670
PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS Filed July 13, 1962 6 Sheets-Sheet 2 Y\ a 15 l INVENTOR BY wmwdw ATTORNEYS June 21, 1966 E. TERSIGNI 3,256,670
PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS Filed July 15, 1962 6 Sheets-Sheet 3 9W4 INVENTOR ATTORNEYS June 21, 1966 E. TERSIGNI 3,255,670
PREFABRIGATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT 0F FLOORS Filed July 13, 1962 6 Sheets-Sheet 4 52 E e E 3 E"- "E a a E is E E N\ i E "-5 k INVENTOR ATTORNEY June 21, 1966 E. TERSIGNI 3,256,670
PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS Filed July 15, 1962 6 Sheets-Sheet 5 INVENTOR BY UJMWK-M,
ATTORNEYS June 21, 1966 TERs|GN| 3,256,670
PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS Filed July 13, 1962 6 Sheets-Sheet 6 Fly. [8 ii? INVENTOR BY MJLM MPM ATTORNEYS United States Patent 3,256,670 PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT 0F FLOORS Ennio Tersigni, Via Salaria 330B, Rome, Italy Filed July 13, 1962, Ser. No. 209,510 Claims priority, application Italy, July 26, 1961, 13,507/ 61 1 Claim. (Cl. 52-634) The object of this invention is to provide girders made of steel sheets, for the reinforcement of building floors, suitable to be manufactured at low cost, in mass production to obtain uniformly sized elements adapted to be easily and quickly installed.
This invention provides a double tubular construction with a connection web, obtained from a steel sheet having a thickness from 1 mm. to 3 mm., by an automatically performed shaping process and having any desired length. The raw steel sheet can be previously punched in order to obtain a particular array of holes causing the metal joist to form, in reinforced concrete, an integral unit with the concrete mix which enters through said holes of both the punched tubular members forming the upper and lower wings, and of the web of the joists, so that these will :be entirely embedded within the concrete, particularly when vibration is used.
The particular profile of the joist allows it to be rigid even during the concrete casting and setting stages and to form a support for the casing made of a ribbed sheet for retaining the casting. The joists also form the skeleton and reinforcement of the floor structure.
Joists made of steel sheets for floor reinforcement can be utilized for the carrying structure of a building of reinforced concrete, or for buildings having bearing walls made of bricks or stones, by anchoring said joists to the reinforcing rods of the concrete in the first case or by arranging them within the connection seams in the second case.
The joists can also form the carrier units of the floor and relieve the stresses acting on cement pillars or on iron columns or on bearing walls.
This invention will be hereinafter described only by way of non-limitative example with reference to the attached drawings showing one preferred embodiment of the said invention.
In the drawings:
FIG. 1 is a cross-sectional view of the joist according to this invention;
FIG. 2 is a partial side elevation;
FIG. 3 is a bottom plan view;
FIG. 4 is a top plan view;
FIG. 5 is a perspective view;
FIG. 6 is a cross-sectional view of two coupled carrying joists, with a relief joist and associated connecting plates:
FIG. 7 is a top plan view corresponding to FIG. 6;
FIG. 8 shows the detail of the upper connecting plate, in top plan view;
FIG. 9 shows a cross-sectional View taken along the plane IXIX of FIG. 8;
FIG. 10 shows a cross-sectional view taken along the plane X-X of FIG. 8;
FIG. 11 shows the lower connecting plate, in bottom plan view;
FIG. 12 shows a cross-sectional View of FIG. 11 taken along the plane XIIXII of said figure;
FIG. 13 shows a cross-sectional view taken along the plane XIII-XIII of FIG. 11;
FIG. 14 shows a longitudinal section-a1 view of the plate of FIG. 11;
FIG. 15 shows the profile of a relief joist with a lower channel for a simple rest;
3,256,670 Patented June 21, 1966 FIG. 16 is a side elevational view;
FIG. 17 is a perspective view of the joist of FIG. 15;
FIG. 18 is a front elevational view of the relief joist with a reversed V plate;
FIG. 19 is a side view corresponding to that of FIG. 18;
FIG. 20 is a top plan view.
With reference to FIGS. 1 to 5, this invention provides a metal joist manufactured from steel sheet, sheared and bent by an industrial, continuous and automatic machining. The joist comprises a base or supporting portion 1 which is connected to the web 2 by means of the two inclined sides 3, and ends at its top with a tubular rib i, the top of which is provided with a continuous ridge 5.
As shown in the FIGURES 3 and 4, holes 6 can be provided in the base plate, while other holes 7 start from the sides 3, and pass through the web 2 and the tubular upperrib 4, so as to obtain a light-weight shape without affecting its strength. As aforesaid, the joist is manufactured from a single steel sheet which is bent and welded along the junction edge 8.
FIGURES 6 and 7 show two coupled joists 22 in twin arrangement, connected to a third joist 21 arranged transversely to the joists 22 to relieve the stresses acting thereon.
The connection of the joist 22 with the transverse joist 21 is obtained by an upper plate 9 and a lower plate It) which are shaped to engage both the joists 22 and transverse joist 21 so as to form a rigid unit thus avoiding punching, bolting or other connection devices requiring difficult operations.
The upper plate 9 (shown also in FIGURES 8 to 10) is provided with a longitudinal rib 11 resting on the ridge 5 of the relief joist and with two parallel ribs 12 which rest on the ridges of the two carrying joists located sideby-side. The connection of the upper joist portion is completed by folding the flange 13 against the associated side of the rib 4 of the outer joist.
Thelower connecting plate 10 (shown also in FIGURES 11 to 14) consists of two stiffening ribs 14 provided under the flange of the relief joist, two flanges 15 which are bent against the sides of said joist, and two cross-flanges 16 which are folded onto the outer sides of the two carrier joists located side-by-si-de, as shown in FIGURE 6. In FIGURES l5, l6 and 17 the joist rests on a metal support channel 17 to be used in case of simple support.
If the joist is to be connected to a support metal structure, as for instance a pillar or a girder of metal shape, a connecting plate It is provided having an inverted V shape and located transversely with respect to the head of the joist, said plate 18 being provided with fastening flanges 19 having holes 20 for the direct fixing by means of bolts or any other equivalent means.
This invention has been disclosed in one preferred embodiment and it will be apparent that various changes might be made in the form, construction and arrangement of the parts without departing from the scope of the invention.
What is claimed is:
A joist structure for reinforcement of building floors in concrete mixes comprising in combination a pair of joists arranged side by side and having a hollow lower support portion having in cross section an isosceles triangle shape, the apex of said triangle being directed upwardly, a hollow upper portion having in cross section an isosceles triangle shape, the apex of said triangle being directed downwardly and the leg of said last named portion opposite said apex having a dihedral shape with its apex extending upwardly, a pair of contiguous webs connecting said port-ions to one another, one of said webs forming a unit with said portions and the other web comprising projections of both portions welded to one another, said webs and portions having holes for embedding the joist within the concrete, a third similar joist arranged perpendicularly to said pair of joists, an upper plate having a central longitudinal groove engaging the upper portion of said third joist and two cross grooves engaging the upper portions of said joist pair, a lower plate having two upwardly turned pliable flanges for engaging the lower portions of said joist pair and two upwardly turned rigid flanges engaging the lower portion of said third joist, said upper and lower plate rigidly connecting said joist to :form a unit.
References Cited by the Examiner UNITED STATES PATENTS FOREIGN PATENTS 5/1960 France.
OTHER REFERENCES 10 The Lewen System: page 14, copyright 1912.
FRANK L. ABBOTT, Primary Examiner.
HENRY C. SUTHERLAND, Examiner.
15 M. O. WARNECKE, Assistant Examiner.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US774484 *||Nov 1, 1902||Nov 8, 1904||Chauncey F Lufkin||Metallic railway-tie.|
|US991603 *||Sep 22, 1910||May 9, 1911||George William Brooks||Fireproof beam.|
|US1351615 *||Jan 28, 1920||Aug 31, 1920||Eugene Brown Edward||Metal construction|
|US1357073 *||Jan 9, 1920||Oct 26, 1920||Joseph Mooney Dermot||Metal construction|
|US1924880 *||Feb 7, 1930||Aug 29, 1933||Budd Edward G Mfg Co||Open truss girder|
|US2092472 *||Dec 4, 1936||Sep 7, 1937||Rafter Machine Company||Stud and rafter|
|FR1235452A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3381439 *||Oct 21, 1965||May 7, 1968||United States Gypsum Co||Structural member|
|US3479777 *||Mar 22, 1968||Nov 25, 1969||Concrete Conduit Co Inc||Underground utility vault with a ventilator-type grate|
|US3698224 *||Nov 16, 1970||Oct 17, 1972||Siderurgica Occidental C A||Process for the production of steel structural shapes|
|US3761046 *||Nov 10, 1971||Sep 25, 1973||Stelmo Ltd||Table for concrete casting|
|US4394807 *||Mar 20, 1981||Jul 26, 1983||Carroll Frank E||Sheet metal structural shape|
|US4507901 *||Sep 19, 1978||Apr 2, 1985||Carroll Frank E||Sheet metal structural shape and use in building structures|
|US4731560 *||Feb 7, 1974||Mar 15, 1988||Owens-Illinois Television Products, Inc.||Multiple gaseous discharge display/memory panel having improved operating life|
|US5163225 *||Apr 28, 1992||Nov 17, 1992||Tube Technology Pty Ltd.||Process for forming a structural member utilizing high frequency electrical induction or resistance welding|
|US5373679 *||Aug 9, 1993||Dec 20, 1994||Tube Technology Pty Ltd||Structural member and process for forming same|
|US5403986 *||Sep 25, 1991||Apr 4, 1995||Tube Technology Pty. Ltd.||Structural member and method of making by cold rolling followed by induction or resistance welding|
|US5501053 *||Sep 25, 1991||Mar 26, 1996||Tube Technology Pty., Ltd.||Interengageable structural members|
|US6115986 *||Aug 29, 1997||Sep 12, 2000||Bhp Steel (Jla) Pty Ltd||Stackable box stud|
|US6131362 *||Feb 2, 1999||Oct 17, 2000||Buecker Machine & Iron Works, Inc.||Sheet metal beam|
|US7231746 *||Jan 29, 2004||Jun 19, 2007||Bodnar Ernest R||Sheet metal stud and composite construction panel and method|
|US7832168 *||Mar 2, 2009||Nov 16, 2010||Usg Interiors, Inc.||Grid tee for suspension ceiling|
|US7891155 *||Feb 15, 2007||Feb 22, 2011||Surowiecki Matt F||Sheet metal header beam|
|US8181423||Mar 15, 2011||May 22, 2012||Smorgon Steel Litesteel Products Pty Ltd.||Beam|
|US8201384 *||Nov 23, 2006||Jun 19, 2012||Stefan Krestel||Girder-like structural element composed of individual parts connected to one another|
|US8266860||Feb 1, 2008||Sep 18, 2012||Usg Interiors, Llc||Grid tee for suspension ceiling|
|US8397462||Jun 3, 2011||Mar 19, 2013||Usg Interiors, Llc||Open web grid runner|
|US8567150 *||May 16, 2007||Oct 29, 2013||Airbus Operations Sas||Aircraft pressurized floor|
|US8672265||Mar 5, 2008||Mar 18, 2014||Airbus Operations Sas||Container for air freight transport and fuselage of an aircraft for freight transport|
|US9021759||Jun 13, 2012||May 5, 2015||Usg Interiors, Llc||Serpentine insert for open web grid|
|US9525685||Dec 28, 2015||Dec 20, 2016||Bank Of America Corporation||User authentication based on other applications|
|US9600817||Mar 4, 2014||Mar 21, 2017||Bank Of America Corporation||Foreign exchange token|
|US9600844||Mar 4, 2014||Mar 21, 2017||Bank Of America Corporation||Foreign cross-issued token|
|US9628495||Feb 17, 2016||Apr 18, 2017||Bank Of America Corporation||Self-selected user access based on specific authentication types|
|US9641539||Oct 30, 2015||May 2, 2017||Bank Of America Corporation||Passive based security escalation to shut off of application based on rules event triggering|
|US20020108345 *||Apr 9, 2002||Aug 15, 2002||Walker Steven H.||Metal structural member|
|US20040182041 *||Jan 29, 2004||Sep 23, 2004||Bodnar Ernest R.||Sheet metal stud and composite construction panel and method|
|US20080134611 *||Feb 1, 2008||Jun 12, 2008||Usg Interiors, Inc.||Grid tee for suspension ceiling|
|US20080155934 *||Dec 29, 2006||Jul 3, 2008||Usg Interiors, Inc.||Easy cut suspension grid|
|US20080196332 *||Feb 15, 2007||Aug 21, 2008||Surowiecki Matt F||Sheet metal header beam|
|US20080264936 *||Mar 5, 2008||Oct 30, 2008||Christian Godenzi||Container for air freight transport and fuselage of an aircraft for freight transport|
|US20090013628 *||Nov 23, 2006||Jan 15, 2009||Stefan Krestel||Girder-like structural element composed of individual parts connected to one another|
|US20090158684 *||Mar 2, 2009||Jun 25, 2009||Usg Interiors, Inc.||Grid tee for suspension ceiling|
|US20100032523 *||Oct 4, 2007||Feb 11, 2010||Airbus France||Aircraft fuselage made from longitudinal panels and method of producing such a fuselage|
|US20100282903 *||May 16, 2007||Nov 11, 2010||Airbus France||Aircraft pressurized floor|
|US20110078968 *||Jun 16, 2010||Apr 7, 2011||James Ferrell||Single Strip - Double Web Ceiling Grid Member|
|US20110162320 *||Mar 15, 2011||Jul 7, 2011||Smorgon Steel Litesteel Products Pty Ltd||Beam|
|US20120328898 *||Jul 22, 2010||Dec 27, 2012||Best Joist Inc.||Roll formed steel beam|
|EP2527554A1 *||May 23, 2011||Nov 28, 2012||Vbi Ontwikkeling B.V.||Beam and block floor|
|EP2527554B1||May 23, 2011||Mar 18, 2015||Vbi Ontwikkeling B.V.||Beam and block floor|
|EP2899328A3 *||May 23, 2011||Aug 12, 2015||Vbi Ontwikkeling B.V.||Beam and block floor|
|WO1991017328A1 *||Apr 29, 1991||Nov 14, 1991||Ram Navon||Structural beam|
|WO2007134790A1 *||May 16, 2007||Nov 29, 2007||Airbus France||Pressure-sealed floor for aircraft|
|U.S. Classification||52/634, 52/696, D25/132, 52/842, 52/666|
|International Classification||E04C5/065, E04C3/04, E04C5/01, E04C3/09|
|Cooperative Classification||E04C3/09, E04C2003/043, E04C5/065, E04C2003/046, E04C2003/0421|
|European Classification||E04C3/09, E04C5/065|